Hi Ron,
One set of warning guidelines exists in UL 913 (standard for intrinsically
safe equipment) cl. 17doesn't address cell phone use specifically but
directly addresses the batteries.
NEC Article 500 invokes the need to address the fact that batteries in
portable electronic equipment can
On Thu, 21 Feb 2002 14:03:59 +0100,
Pierre SELVA \(eLABs\) e.l...@wanadoo.fr wrote:
Can somebody remember me this classification using 5VA, 5VB, ... ? and what
are the equivalence (if any) with the classification defined by UL94 ?
I know the classification HB, V2, V1, V0, 5V, but I cannot
This may seem like a dumb question, but how would a cellphone pose a
hazard? I am unaware of anything in a cellphone that can cause any kind
of a spark or arc that might start combustion in such an atmosphere.
Certainly none of the keypad contacts could cause a problem.
Bob Wilson
TIR Systems
We are required (by the standards, general morality, legal liability, etc)
to ensure that products will remain 'safe' under worst case conditions.
Hence we spend much soul-searching to evaluate and to test under
'worst-case' conditions.
Fuzing in most countries is generally via a 16 A CB or
I read in !emc-pstc that Brian O'Connell boconn...@t-yuden.com wrote
(in f7e9180f6f7f5840858d3db815e4f7ad1f2...@cms21.t-yuden.com) about
'60950 SFC', on Fri, 22 Feb 2002:
My notes from an agency (60950) seminar state that fault conditions shall be
done with 16A installation fuses. I cannot find
Darrell:
With respect to your radiated emissions dilemna, useful information
would be the clock speeds, cable lengths, and worst-case mode of
operation at which emissions are the highest. Generally, if you invoke
the divide and conquer rule, it should be an easier matter pinpointing
the dominant
Good People of PSTC
My notes from an agency (60950) seminar state that fault conditions shall be
done with 16A installation fuses. I cannot find any clause in EN60950:2000
or UL60950, 3d Ed with this requirement.
Is this test requirement in one the stds listed in 60950, or am I blind?
R/S,
The source may be differential, but common mode currents generally
contribute much more to radiated emissions, especially with cables... It
sounds like you have cable radiation (100MHz) as well as maybe slot
radiation (600MHz)... Tell us more about your device's test setup... (i.e.
chassis and
Well, just briefly. The backwards UR is a component recognition. It can
be used in a end unit only if the conditions of acceptability that are placed
in the UL report are met. E. G. Power supplies would have obvious things like
the end use product must provide and adequate fire
Hello Rich et al,
If you visit the Safety Link www.safetylink.com and click on the acronym
CCC you will be taken to a page where the official documentation resides
(pdf files, in English) and, there's no need to register to gain this
valuable and useful information.
And, the new China
A very quick and basic summary:
Very roughly speaking, the UL marks can be interpretted as follows. (OK
there are pages and pages of jargon attached to each but the quick messy
answers are):
the UL, UL listed and CUL listed products are those that have been tested at
a UL test facility and
You don't know the half of it. Check out the following:
http://www.ul.com/mark/
Best regards,
Brian Epstein
Sr Regulatory Compliance Engineer
Veeco Metrology
112 Robin Hill Rd
Santa Barbara CA 93117
805-967-2700 x2315
brian.epst...@veeco.com mailto:brian.epst...@veeco.com
-Original
Chris
Here is a great link that describes the different UL marks.
http://www.ul.com/mark/index.html
Kati Wenzel
-Original Message-
From: Chris Maxwell [mailto:chris.maxw...@nettest.com]
Sent: Friday, February 22, 2002 8:40 AM
To: EMC-PSTC Internet Forum
Subject: Different shades of UL
Chris: you probably will get this question answered by many people.
go to the following link and you will find all you need
http://www.ul.com/mark/index.html
Jim Allan
Manager, Engineering Services
Kentrox LLC
1619 N Harrison Parkway
Sunrise, FL, 33323
E-mail james_al...@milgo.com
Phone (954)
UL has a page entitled UL's Marks -- What they look like and what they
mean
http://www.ul.com/mark/
Richard Woods
Sensormatic Electronics
Tyco International
-Original Message-
From: Chris Maxwell [mailto:chris.maxw...@nettest.com]
Sent: Friday, February 22, 2002 9:40 AM
To: EMC-PSTC
Chris,
See attached link which might be helpful to you. The information may be
found in UL's site http://www.ul.com
TGIF!
PETER S. MERGUERIAN
Technical Director
I.T.L. (Product Testing) Ltd.
26 Hacharoshet St., POB 211
Or Yehuda 60251, Israel
Tel: + 972-(0)3-5339022 Fax: + 972-(0)3-5339019
Chris,
Your best bet is to get it from the source at:
http://www.ul.com/mark/
Best regards,
Dave Lorusso
Director of Product Integrity
General Bandwidth, Inc.
12303 Technology Blvd.
Austin, TX 78727
512-681-5480 (phone)
512-681-5481 (fax)
dave.loru...@genband.com
www.genband.com
Chris
Try this web address, it explains all the various UL marks and what they
mean.
http://www.ul.com/mark/index.html
Andrew Carson - Senior Compliance Engineer, Xyratex, UK
Phone: +44 (0)23 9249 6855 Fax: +44 (0)23 9249 6014
-Original Message-
From: Chris Maxwell
Chris,
Go to the following site and it explains it very well with examples.
http://www.ul.com/mark/index.html
The information not covered are the :
product type (e.g., I.T.E.) (there is a lot of variation allowed
here),
4 character Listing Mark Control Number (LMCN) which is a
Esteemed Colleages;
Has anyone had experience using Audio-Codec '97 (AC 97) topology with
respect to EMC performance. It is commonly used in PC sound cards. We have
a device that incorporates this technology for voice recognition and are
seeing very high emissions between 100-600 MHz. The
Chris,
The RU is the Recognized mark. It is applicable to products that are
incomplete in construction features or limited performance capabilities so as
not to warrant their acceptability as a field installed component. This
mark does not look like a UL mark because it is not for public or
Hi Chris,
Explain, no. But, you will find the answer to your question at:
http://www.ul.com/mark/index.html
There, you should be able to find every kind of UL mark, and then some. Each
has has a short
description.
I hope this helps.
Best regards,
Ron Pickard
rpick...@hypercom.com
try this Chris. It'll explain all.
http://www.ul.com/mark/index.html
John Juhasz
Fiber Options
Bohemia, NY
-Original Message-
From: Chris Maxwell [mailto:chris.maxw...@nettest.com]
Sent: Friday, February 22, 2002 9:40 AM
To: EMC-PSTC Internet Forum
Subject: Different shades of UL
Hi
Gas discharge tubes can be very complex devices and have a number of
specifications. Normally the voltage spec that you see is the DC
specification, in other words, the firing voltage if the voltage is slowly
ramped up (2kV/second is on rate used); however, the impulse voltage -- the
voltage at
Hi all,
I know that this has been covered before. But please indulge my
ignorance.
There are many different forms of UL marks, each with subtle
differences.
There is the UL in a circle. There is also the mirror lettered RU.
There are also some subscripts denoting approval for Canada as
Robert
Any radio source can prove hazardous in explosive atmospheres. Metal
work of the right shape and size can act as an antenna, then all that is
required is momentary discontinuity, or a momentary return path to
ground and a spark will form.
The petrochemical industrial have been aware of
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